In which phase of Internet Key Exchange (IKE) protocol is peer authentication performed?

A.
Pre Initialization Phase

B.
Phase 1

C.
Phase 2

D.
No peer authentication is performed

Explanation:
When two computers (peers) use IPsec to communicate, they create two kinds of security associations. In the
first, called main mode or phase one, the peers mutually authenticate themselves to each other, thus
establishing trust between the computers. In the second, called quick mode or phase two, the peers will
negotiate the particulars of the security association, including how they will digitally sign and encrypt traffic
between them.
Incorrect Answers:
A: The phase in which peer authentication is performed is not known as the Pre Initialization Phase.
C: Peer authentication is performed in phase 1, not phase 2.
D: It is not true that no peer authentication is performed.

https://technet.microsoft.com/en-us/library/cc512617.aspx